A multifunctional hydrogen sensor evaluation test device and method

Abstract

The application discloses a multifunctional hydrogen sensor evaluation test device and method, which comprises a sealed test box, a high-low temperature alternating damp heat test box, a gas control module and a test analysis module. The sealed test box and the high-low temperature alternating damp heat test box form a nested box, the gas exchange between the two boxes enables the inside and outside of the sealed test box to be completely in the constant temperature and humidity environment of the high-low temperature alternating damp heat test box, and the temperature and humidity control are provided by the temperature control module and the humidity control module in the high-low temperature alternating damp heat test box. The hydrogen is always controlled in the sealed device, so that the safety of the experimental process is ensured; the nested box structure is simple to operate; by adjusting different temperature and humidity and configuring different proportions of test (interference / toxic) gas, the performance evaluation test of one or more hydrogen sensors under different hydrogen concentrations can be stably carried out; and the anti-toxicity performance evaluation test can be carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydrogen sensor performance testing, in particular to a multifunctional hydrogen sensor evaluation testing device and method. BACKGROUND

[0002] Hydrogen is a colorless, odorless, tasteless, flammable and explosive gas, and at normal temperature and pressure, when the volume concentration is 4.0-75.6%, it will explode when encountering an open flame. Therefore, hydrogen sensors are often used to detect the presence of hydrogen and quantify its concentration. According to the different detection principles, hydrogen sensors can be divided into catalytic combustion type, electrochemical type, resistance type, optical fiber type, and thermal conductivity type.

[0003] Compared with other types of sensors, electrochemical sensors have high sensitivity, good accuracy, and low power consumption, and have received widespread attention. However, their sensing performance is easily affected by temperature and humidity fluctuations, and toxic gases have a greater impact on their interference. Therefore, the following factors that affect the performance of hydrogen sensors include: (1) temperature, as temperature and hydration can affect the microstructure of the polymer electrolyte membrane and the transport of water molecules and hydrogen ions, thereby affecting the response sensitivity of the proton exchange membrane fuel cell type hydrogen sensor (electrochemical type) (Membranes, 2021, 11(9): 695); (2) humidity, the geometric size and electrical properties (mainly electrical conductivity) of Nafion membranes are largely dependent on the water content of the polymer, so the relative humidity of the gas determines the size of the response value of the proton exchange membrane fuel cell type (electrochemical type) sensor in the gas phase (Analytica Chimica Acta, 1999, 385(1): 151-162); (3) harmful gases, electrochemical sensors using platinum and other materials as catalysts can be poisoned by CO X and NO X and sulfur-containing compounds, etc., resulting in increased response time, reduced sensitivity and stability of the sensor (Sensors and Actuators B: Chemical, 2011, 157(2): 329-352).

[0004] At present, various hydrogen sensor evaluation test devices have been reported. Patent CN 102998354 A introduces a solid electrolyte gas sensor performance test device, which introduces a reference gas input system, can control the reference gas, and eliminates the measurement error caused by the quality fluctuation of the reference gas in the sensor performance measurement process. Patent CN 111896602 A proposes a hydrogen quality detection device and detection method, which can be used for online real-time monitoring and sampling inspection; patent CN 113125638 A introduces a hydrogen concentration sensor performance test device, which inserts the to-be-tested hydrogen concentration sensor into the reaction cavity through the detection box, at this time the to-be-tested hydrogen concentration sensor triggers the flap to make the inside and outside of the reaction cavity communicate, so that the test gas enters the reaction cavity, and then the to-be-tested hydrogen concentration sensor reacts with the test gas in the reaction cavity, and after the test is completed, the to-be-tested hydrogen concentration sensor is extracted, at this time the inside and outside of the reaction cavity are not communicated, so as to avoid the test gas flowing out.

[0005] In summary, the current hydrogen sensor test device still has the following problems: lack of adjustable hydrogen sensor test temperature and humidity, and hydrogen sensor anti-poisoning test device. SUMMARY

[0006] To solve the problems of the prior art, the present application provides a multifunctional hydrogen sensor evaluation test device and method, which adopts a nested box structure, adjusts different temperature and humidity, configures different test (interference / toxic) gases, and can stably perform one or more hydrogen sensor performance evaluation tests under different hydrogen concentrations. The experimental process is safe and reliable.

[0007] The technical scheme of the present application is as follows:

[0008] A multifunctional hydrogen sensor evaluation test device, comprising a sealed test box, a high-low temperature alternating humidity test box, a gas control module and a test analysis module, the inside of the high-low temperature alternating humidity test box is provided with the sealed test box, the gas control module and the test analysis module are arranged outside the high-low temperature alternating humidity test box, and the sealed test box is connected with the gas control module and the test analysis module respectively.

[0009] The sealed test box comprises a sealed test box body and a sealed test box door, the inside of the sealed test box body is provided with a to-be-tested hydrogen sensor, a multi-hole plate and a fan, the bottom of the sealed test box body is provided with the fan, the upper side of the fan is provided with the multi-hole plate, the to-be-tested hydrogen sensor is placed on the multi-hole plate, the inner side wall of the sealed test box body is provided with a multi-hole plate clamping groove, the multi-hole plate clamping groove is used for placing the multi-hole plate and providing support for the multi-hole plate, and the sealed test box body is provided with an air inlet, an air outlet and a pressure gauge.

[0010] The high-low temperature alternating humidity test chamber comprises a high-low temperature alternating humidity test chamber body, a high-low temperature alternating humidity test chamber door, a temperature control module and a humidity control module.

[0011] The sealed test chamber is placed in the high-low temperature alternating humidity test chamber to form a nested chamber. The sealed test chamber body of the nested chamber is completely in the humidity control (constant temperature and humidity) environment of the high-low temperature alternating humidity test chamber, and the air in the sealed test chamber reaches the target temperature and humidity through gas exchange between the sealed test chamber and the high-low temperature alternating humidity test chamber; the temperature and humidity control in the sealed test chamber are provided by the temperature control module and the humidity control module in the high-low temperature alternating humidity test chamber, respectively.

[0012] The gas control module can be used to provide different concentrations of hydrogen and other interfering / toxic gases to the sealed test chamber for testing the effect of other interfering / toxic gases on the hydrogen sensor; the gas control module comprises a pressure reducing valve, a gas mass flow controller, a gas mixer and a vacuum pump, the pressure reducing valve is connected with the gas inlet of the sealed test chamber through the gas mass flow controller and the gas mixer in sequence, and the gas outlet of the sealed test chamber is connected with the vacuum pump.

[0013] The test analysis module comprises a current recorder and a PC end, and can perform signal acquisition and signal processing analysis; the test analysis module is connected with the hydrogen sensor to be tested in the sealed test chamber.

[0014] Based on the above technical scheme, further, the sealed test chamber body and the sealed test chamber door are connected through opening and closing.

[0015] Based on the above technical scheme, further, the sealed test chamber body, the sealed test chamber door perforated plate and the perforated plate clamping groove are made of polymethyl methacrylate material, realizing the visualization of the test process.

[0016] Based on the above technical scheme, further, a sealing ring is arranged between the sealed test chamber door and the sealed test chamber body, and the sealing performance is good.

[0017] Based on the above technical scheme, further, a movable perforated plate is arranged in the sealed test chamber, which allows gas flow while placing the hydrogen sensor.

[0018] Based on the above technical scheme, further, the gas inlet and the gas outlet of the sealed test chamber are located on both sides of the sealed test chamber body, and the pressure gauge is located on the top of the sealed test chamber body.

[0019] Based on the above technical scheme, further, the sealing test box body is provided with a plurality of multi-well plate slots with different heights. The multi-well plate can also adjust the height of the hydrogen sensor in the sealing test box by being placed in multi-well plate slots with different heights. Multiple hydrogen sensors can also be placed on multi-well plates at different heights to batch test hydrogen sensors.

[0020] Based on the above technical scheme, further, the high-low temperature alternating humidity test chamber box body is connected with the high-low temperature alternating humidity test chamber door.

[0021] Based on the above technical scheme, further, the high-low temperature alternating humidity test chamber box body is provided with ventilation holes. When the gas in the box body decreases, air can be continuously supplied from the outside to the inside of the box. For example, a row of ventilation holes can be provided at the bottom of the back of the high-low temperature alternating humidity test chamber box body (the surface opposite to the door).

[0022] Based on the above technical scheme, further, the hydrogen passes through the pressure reducing valve and the gas mass flow meter to enter the gas mixer. Other interfering / toxic gases pass through the pressure reducing valve and the gas mass flow meter to enter the gas mixer. The hydrogen and other interfering / toxic gases are mixed in the gas mixer, and then enter the sealing test box through the gas inlet.

[0023] Based on the above technical scheme, further, the test line is connected between the to-be-tested hydrogen sensor and the test analysis module. The sealing test box body is embedded with an aviation plugboard, which is embedded on the box body of the sealing test box and connects the test line inside and outside the sealing test box. The test line is connected from the to-be-tested hydrogen sensor to one end of the aviation plugboard inside the sealing test box body, and then connected to the test end from the other end of the aviation plugboard outside the sealing test box body. The hydrogen sensor signal can be transmitted from the box body to the test analysis module outside the box body, and the air tightness of the box body during signal transmission is ensured.

[0024] Based on the above technical scheme, further, a fan is installed in the sealing test box body. The fan can enhance the disturbance and make the gas uniformly dispersed in the sealing test box.

[0025] Based on the above technical scheme, further, a plurality of test lines can be connected to a plurality of different hydrogen sensors, and a plurality of hydrogen sensors can be tested at the same time.

[0026] Based on the above technical scheme, further, a pressure stabilizing device is provided between the sealing test box body and the pressure gauge, so that the pressure in the sealing test box during the experiment can be stabilized at atmospheric pressure.

[0027] Based on the above technical scheme, further, the temperature control module and the humidity control module in the high-low temperature alternating humidity test chamber can monitor the temperature and humidity of the test process in real time and stably provide the required temperature and humidity environment for the experiment.

[0028] Based on the above technical scheme, further, other interference / toxic gas is carbon oxide and nitrogen oxide and sulfur-containing compounds, etc., the gas control module can provide hydrogen and interference / toxic gas for different hydrogen concentration test and anti-toxic test, connected with pressure reducing valve, gas mass flow controller, gas mixer connected to the gas inlet of the sealed test box, the gas outlet of the sealed test box is connected to the vacuum pump, and then connected to the outside atmosphere.

[0029] Based on the above technical scheme, further, hydrogen and other interference / toxic gas are connected to the gas inlet of the sealed test box in turn through the pressure reducing valve, the gas mass flow controller, the gas mixer, the gas outlet of the sealed test box is connected to the vacuum pump, and then connected to the outside atmosphere.

[0030] Based on the above technical scheme, further, the gas inlet of the sealed test box is connected with the gas mixer of the gas control module through valve I; the gas inlet of the sealed test box is connected with the gas in the high-low temperature alternating damp heat test chamber through valve II; the gas outlet of the sealed test box is connected with the vacuum pump of the gas control module through valve III.

[0031] Based on the above technical scheme, further, the electric signal generated by the sensor is connected by the test line, transmitted to the current recorder through the aviation plugboard, and finally analyzed in the PC end.

[0032] Based on the above technical scheme, further, the electric signal collected by the current recorder is voltage or current, and the relationship between the obtained voltage or current value and time and concentration can be analyzed after processing in the PC end, so as to obtain the response current maximum value of the sensor (each hydrogen concentration has a response current maximum value), sensitivity, response time and recovery time and other sensor performance indexes.

[0033] Based on the above technical scheme, further, the sealed test box is 8L in volume.

[0034] Based on the above technical scheme, further, the high-low temperature alternating damp heat test chamber body is a cube of 450*450*450mm. 3

[0035] The test method of the multifunctional hydrogen sensor evaluation test device has the characteristics that it comprises the following steps:

[0036] ​(1)First, set the temperature and humidity values of the high-low temperature alternating damp heat test chamber, control the temperature and humidity through the temperature control module and the humidity module, open the valve II and the valve III after the high-low temperature alternating damp heat test chamber reaches the target temperature and humidity and is stable, connect the sealed test chamber and the high-low temperature alternating damp heat test chamber through the air inlet, make the sealed test chamber and the outside atmosphere communicate through the air outlet, start the vacuum pump, this process will exhaust the gas in the sealed test chamber to the outside atmosphere, the air in the high-low temperature alternating damp heat test chamber reaching the set temperature and humidity enters the sealed test chamber, after a period of time, close the valve II and the valve III, close the vacuum pump, the gas in the sealed test chamber 1 will be completely replaced by the stable air with the set temperature and humidity.

[0037] (2)Open the valve I, connect the gas control module with the sealed test chamber through the air inlet. The specific operation of the gas control module to provide test gas is: hydrogen passes through the pressure reducing valve, the gas mass flow controller, the gas mixer, the air inlet, and then enters the sealed test chamber, closes the valve I at the end of the aeration, controls a stable gas flow through the gas mass flow controller, controls the aeration time, and different concentrations of hydrogen-air mixed gas can be configured in the sealed test chamber, at this time, no other interfering gas / toxic gas is introduced into the gas circuit. When performing anti-toxicity test, only other interfering / toxic gas is introduced into the gas circuit through the pressure reducing valve and the gas mass flow controller, hydrogen and other interfering / toxic gas are mixed in the gas mixer, and then enter the sealed test chamber through the valve I and the air inlet, repeat the above operation (close the valve I at the end of the aeration, control a stable gas flow through the gas mass flow controller, control the aeration time), and different concentrations of hydrogen-air mixed gas containing other interfering / toxic gas can be configured in the sealed test chamber.

[0038] (3)The measured hydrogen sensor contacts the configured test gas to produce a physical and chemical reaction, and the transmission path of the generated electric signal is: the measured hydrogen sensor, the test line, the embedded aviation plug-in board of the chamber body, the test line, the signal acquisition and signal processing analysis are performed on the current recorder and the PC end. The aviation plug-in board is used to ensure the sealing of the sealed test chamber during the whole test process.

[0039] Based on the above technical scheme, after one test is completed, repeat the previous operation (the operation of the above step (1)), open the valve II and the valve III, start the vacuum pump, after a period of time, close the valve II and the valve III, close the vacuum pump, the gas in the sealed test chamber 1 will return to the previous state, and be completely replaced by the stable air with the set temperature and humidity again; repeat steps (2) and (3) to test. After one test is completed, the set temperature and humidity of the high-low temperature alternating damp heat test chamber can be adjusted or not.

[0040] Based on the above technical scheme, further, the fan is always kept in the starting state during the test process, which can enhance the airflow disturbance and make the gas always uniformly dispersed in the sealed test box.

[0041] Based on the above technical scheme, further, the high-low temperature alternating damp heat test box can control variables including temperature and humidity, the controllable temperature range is -40~150 DEG C, and the controllable humidity range is 20~98% RH.

[0042] The application of the multifunctional hydrogen sensor evaluation test device in hydrogen sensor performance test.

[0043] The application has the following advantages:

[0044] (1) The multifunctional hydrogen sensor evaluation test device of the application controls hydrogen in the sealed device at all times, ensuring the safety of the experimental process;

[0045] (2) The application adopts a box-in-box structure, and the operation process is simple;

[0046] (3) The performance of the sensor under different hydrogen concentrations can be tested;

[0047] (4) The influence of temperature and humidity on the performance of the hydrogen sensor can be evaluated by adjusting the test gas with different temperature and humidity;

[0048] (5) The hydrogen sensor can be tested for resistance to toxic gas by introducing test (interference / toxic) gas with different proportions;

[0049] (6) Multiple hydrogen sensors can be tested at the same time.

[0050] (7) The performance of one or more hydrogen sensors can be stably evaluated and tested. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 The figure is a brief structure diagram of the multifunctional hydrogen sensor evaluation test device of the application;

[0052] Figure 2 The figure is a structure diagram of the multifunctional hydrogen sensor evaluation test device of the application;

[0053] Figure 3 The figure is a hydrogen sensor sensing performance diagram of the hydrogen sensor evaluation test device in Example 1 under the condition that the H2 / Air concentration range is 0.5%-4.0%, the temperature is 30 DEG C, and the humidity is 40% RH;

[0054] Figure 4Linear fit plot of response current vs. hydrogen concentration (0.5% to 4.0%) for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 1 (temperature 30°C, humidity 40%);

[0055] Figure 5 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 1 at 0.5% and 1.0% H2 / Air (temperature 30°C, humidity 40%) for three repeats;

[0056] Figure 6 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 2 at 0.5% H2 / Air (temperature 30°C, humidity 40%) for comparison with the effect of the blower;

[0057] Figure 7 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 3 at (minimum) 0.025% and 0.05% H2 / Air;

[0058] Figure 8 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 4 at 0.5% to 4.0% H2 / Air (temperature 30°C, humidity 60% RH);

[0059] Figure 9 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 4 at 0.5% to 4.0% H2 / Air (temperature 30°C, humidity 80% RH);

[0060] Figure 10 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 4 at 0.5% to 4.0% H2 / Air (temperature 30°C, humidity 90% RH);

[0061] Figure 11 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 5 at 0.5% to 4.0% H2 / Air (humidity 30% RH, temperature 20°C);

[0062] Figure 12 Sensor performance plot for the hydrogen sensor tested in the hydrogen sensor evaluation test set-up of Example 5 at 0.5% to 4.0% H2 / Air (humidity 30% RH, temperature 40°C);

[0063] Figure 13is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 5 at H2 / Air concentration range of 0.5% - 4.0% with humidity of 30% RH and temperature of 60°C;

[0064] Figure 14 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 5 at H2 / Air concentration range of 0.5% - 4.0% with humidity of 30% RH and temperature of 80°C;

[0065] Figure 15 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 6 at H2 / Air concentration range of 0.5% - 4.0% with temperature of 0°C;

[0066] Figure 16 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 6 at H2 / Air concentration range of 0.5% - 4.0% with temperature of -20°C;

[0067] Figure 17 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 6 at H2 / Air concentration range of 0.5% - 4.0% with temperature of -40°C;

[0068] Figure 18 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 7 at H2 / Air concentration range of 0.2% - 2.0%;

[0069] Figure 19 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 7 at H2 / Air concentration range of 0.2% - 2.0% with a small amount of CO;

[0070] Figure 20 is the linear fitting curve comparison graph between the response current of the hydrogen sensor obtained by the hydrogen sensor evaluation test device in Example 7 and the hydrogen concentration (0.5% - 4.0%) (with or without CO interference);

[0071] Figure 21 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device in Example 8 at H2 / Air concentration range of 0.5% - 4.0%.

[0072] Explanation of reference signs in the figure: 1, sealed test box; 2, high-low temperature alternating damp heat test box; 3, gas control module; 4, test analysis module; 101, hydrogen sensor to be tested; 102, multi-hole plate; 103, multi-hole plate card slot of different heights; 104, sealed test box door; 105, test line; 106, aviation plugboard; 107, fan; 108, air inlet; 109, air outlet; 110, pressure gauge; 111, pressure stabilizing device; 201, temperature control module; 202, humidity control module; 301, hydrogen; 302, other interfering / toxic gases; 303, pressure reducing valve; 304, gas mass flow controller; 305, gas mixer; 306, vacuum pump; 401, current recorder; 402, PC end; 501, valve I; 502, valve II; 503, valve III. DETAILED DESCRIPTION

[0073] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0074] In the description of the present application, it should be noted that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0075] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0076] As shown in Figure 1 , 2 A multifunctional hydrogen sensor evaluation test device, comprising a sealed test box 1, a high-low temperature alternating damp heat test box 2, a gas control module 3, and a test analysis module 4. The sealed test box 1 is arranged inside the high-low temperature alternating damp heat test box 2. The gas control module 3 and the test analysis module 4 are arranged outside the high-low temperature alternating damp heat test box 2. The sealed test box 1 is connected with the gas control module 3 and the test analysis module 4 respectively.

[0077] The sealed test box 1 is a place for carrying out evaluation test of hydrogen sensor, and comprises a sealed test box body, a hydrogen sensor to be tested 101, a porous plate 102, a porous plate card slot 103 of different heights, a sealed test box door 104, a test line 105, an aviation plugboard 106, a fan 107, an air inlet 108, an air outlet 109, a pressure gauge 110, and a pressure stabilizing device 111. The hydrogen sensor to be tested 101 is arranged at a central position inside the sealed test box body and is supported by the porous plate 102. The height of the hydrogen sensor 101 in the sealed test box 1 can be adjusted by arranging the porous plate 102 in the porous plate card slot 103 of different heights. The test line 105 is connected from the hydrogen sensor to be tested 101 to one end of the aviation plugboard 106 inside the sealed test box body, and is connected to the test analysis module 4 at the other end of the aviation plugboard 106 outside the sealed test box body. The aviation plugboard 106 is embedded on the body of the sealed test box 1 and connects the test line 105 inside and outside the sealed test box 1. The sealed test box body is provided with the air inlet 108, the air outlet 109, and the pressure gauge 110. The air inlet 108 of the sealed test box 1 is located at the left side of the sealed test box body, the air outlet 109 is located at the right side of the sealed test box body, and the pressure gauge 110 is located at the top of the sealed test box body. The pressure stabilizing device is arranged between the sealed test box body and the pressure gauge 110. The fan 107 is installed at the bottom of the sealed test box body and can enhance disturbance to make the gas uniformly dispersed in the sealed test box 1.

[0078] The high-low temperature alternating damp heat test box 2 comprises a high-low temperature alternating damp heat test box body, a high-low temperature alternating damp heat test box door, a temperature control module 201, and a humidity control module 202. The temperature control module 201 can control the temperature of the gas to be tested in the high-low temperature alternating damp heat test box, and the humidity control module 202 can control the humidity of the gas to be tested in the high-low temperature alternating damp heat test box, so as to provide a constant temperature and humidity environment for the hydrogen sensor test.

[0079] The sealed test box 1 is placed in the high-low temperature alternating damp heat test box 2 to form a combined box. The sealed test box 1 in the combined box is completely controlled by the damp heat of the high-low temperature alternating damp heat test box 2, and the gas in the sealed test box 1 reaches the target temperature and humidity through the gas exchange between the sealed test box 1 and the high-low temperature alternating damp heat test box 2. There is a row of ventilation holes at the back and bottom of the high-low temperature alternating damp heat test box body, which can continuously supply air into the box when the gas in the box is reduced.

[0080] The gas control module 3 can provide hydrogen 301 and other interfering / toxic gases 302 for testing the effect of other interfering / toxic gases on the hydrogen sensor, including a pressure reducing valve 303, a gas mass flow controller 304, a gas mixer 305, and a vacuum pump 306. The pressure reducing valve 303 is connected to the gas inlet 108 of the sealed test box 1 through the gas mass flow controller 304 and the gas mixer 305 in turn, and the gas outlet 109 of the sealed test box 1 is connected to the vacuum pump 306.

[0081] The test analysis module 4, including a current recorder 401 and a PC terminal 402, can perform signal acquisition and signal processing analysis, and is connected to the hydrogen sensor 101 to be tested in the sealed test box 1.

[0082] The sealed test box 1 has a volume of 8L, and the sealed test box body, the sealed test box door 104, the multi-well plate 102, and the multi-well plate slot 103 are made of polymethyl methacrylate, achieving visualization of the test process.

[0083] The gas inlet 108 of the sealed test box 1 is connected to the gas mixer 305 of the gas control module 3 through valve I 501; the gas inlet 108 of the sealed test box 1 is connected to the gas in the high-low temperature alternating damp heat test box 2 through valve II 502; and the gas outlet 109 of the sealed test box 1 is connected to the vacuum pump 306 of the gas control module 3 through valve III 503.

[0084] The test method of the multifunctional hydrogen sensor evaluation test device comprises the following steps:

[0085] First, set the temperature and humidity values of the high-low temperature alternating damp heat test box 2, and after reaching the target temperature and humidity values and stabilizing, open valve II 502 and valve III 503, connect the sealed test box 1 and the high-low temperature alternating damp heat test box 2 through the gas inlet 108, and connect the sealed test box 1 and the outside atmosphere through the gas outlet 109, and start the vacuum pump 306. In this process, the gas in the sealed test box 1 is discharged to the outside atmosphere, and the air in the high-low temperature alternating damp heat test box 2 that reaches the set temperature and humidity enters the sealed test box. After a period of time, close valve II 502 and valve III 503, and close the vacuum pump 306. The gas in the sealed test box 1 will be completely replaced by air at a stable set temperature and humidity.

[0086] Open valve Ⅰ 501, and connect the gas control module 4 with the sealed test box 1 through the air inlet 109. The gas control module 3 provides the test gas for the experiment, and the specific operation is as follows: hydrogen 301 is introduced into the sealed test box 1 through the pressure reducing valve 303, the gas mass flow controller 304, the gas mixer 305 and the air inlet 108, and the valve I is closed at the end of the gas introduction. A stable gas flow is controlled through the gas mass flow controller 304, the gas introduction time is controlled, and different concentrations of hydrogen-air mixed gas can be configured in the sealed test box 1. When the anti-poisoning test is performed, only other interference / toxic gases are introduced through the pressure reducing valve 303 and the gas mass flow controller 304, and the hydrogen and the other interference gases are mixed in the gas mixer 305, and then introduced into the sealed test box 1 through the valve Ⅰ 501 and the air inlet 108. The above operation is repeated, and different concentrations of hydrogen-air mixed gas containing other interference / toxic gases 302 can be configured in the sealed test box 1.

[0087] The to-be-tested hydrogen sensor 101 is in physical and chemical reaction with the configured test gas, and the transmission path of the generated electric signal is: the to-be-tested hydrogen sensor 101, the test line 105, the embedded box aviation plugboard 106, the test line 105, the current recorder 401 and the PC end 402, for signal acquisition and signal processing analysis.

[0088] After one test is completed, the previous operation is repeated, the valve Ⅱ 502 and the valve Ⅲ 503 are opened, the vacuum pump 306 is started, after a period of time, the valve Ⅱ 502 and the valve Ⅲ 503 are closed, the vacuum pump 306 is closed, and the gas in the sealed test box 1 will return to the previous state, and the air in the sealed test box 1 is completely replaced by the stable set temperature and humidity air again.

[0089] The fan 107 is always kept in the starting state during the test, and the airflow disturbance is enhanced, so that the gas is always uniformly dispersed in the sealed test box.

[0090] The high-low temperature alternating damp heat test box 2 can control variables including temperature and humidity, the controllable temperature range is -40-150 DEG C, and the controllable humidity range is 20-98% RH.

[0091] The application will be further described below in combination with examples, but the application is not limited by the examples.

[0092] Example 1

[0093] The temperature of the high-low temperature alternating damp heat test chamber 2 is set to 30℃, and the humidity is set to 40% RH. The multi-well plate 102 is placed at a height of 60 mm from the bottom of the sealed test chamber 1. According to the above-described operation, after the air temperature and humidity inside and outside the sealed test chamber 1 reach the set values, the fan 107 is started, the pure hydrogen 301 bottle is opened, the pressure reducing valve 303 is adjusted to 0.15 MPa, and the hydrogen flow is controlled to 160 mL·min by the hydrogen mass flow controller 304. The valve I 501 is opened, and hydrogen is introduced into the sealed test chamber 1 from the air inlet 108. When the hydrogen concentration in the sealed test chamber 1 is 0.5%, the valve I 501 is disconnected, and the aeration stops. After a period of stabilization, the valve II 502, the valve III 503, and the vacuum pump 306 are opened, the gas in the sealed test chamber 1 is exhausted to the atmosphere, and the air with the set temperature and humidity in the high-low temperature alternating damp heat test chamber 2 is replaced into the sealed test chamber 1. In the above process, the sensor reacts with hydrogen, and the response current generated gradually decreases to 0 after being replaced with pure air. The generated current is transmitted to the current recorder 401 through the test line 105 and the aviation plugboard 106, and the data analysis is performed on the PC end 402. The above operation is repeated, and only the aeration time is changed, so that the response curves of different hydrogen concentrations can be obtained. The hydrogen concentration in this paper is the volume fraction. -1 When the hydrogen concentration in the sealed test chamber 1 is 0.5%, the valve I 501 is disconnected, and the aeration stops. After a period of stabilization, the valve II 502, the valve III 503, and the vacuum pump 306 are opened, the gas in the sealed test chamber 1 is exhausted to the atmosphere, and the air with the set temperature and humidity in the high-low temperature alternating damp heat test chamber 2 is replaced into the sealed test chamber 1. In the above process, the sensor reacts with hydrogen, and the response current generated gradually decreases to 0 after being replaced with pure air. The generated current is transmitted to the current recorder 401 through the test line 105 and the aviation plugboard 106, and the data analysis is performed on the PC end 402. The above operation is repeated, and only the aeration time is changed, so that the response curves of different hydrogen concentrations can be obtained. The hydrogen concentration in this paper is the volume fraction.

[0094] Figure 3 is the hydrogen sensor sensing performance diagram of the hydrogen sensor evaluation test device of the present application under the condition that the H2 / Air concentration range is 0.5%-4.0%, the temperature is 30℃, and the humidity is 40%. The response current value range is 1.34 mA (0.5% H2)-31.9 mA (4.0% H2), the response time is 42-112 s, and the recovery time is 34-66 s.

[0095] Figure 4 is the linear fitting curve between the response current and the hydrogen concentration (0.5%-4.0%) of the hydrogen sensor (temperature 30℃, humidity 40%) obtained by the hydrogen sensor evaluation test device of the present application. The sensitivity is about 8.2788 mA / %.

[0096] Figure 5 is the sensing performance diagram of the hydrogen sensor tested by the hydrogen sensor evaluation test device of the present application under the condition of 0.5% and 1.0% H2 / Air (temperature 30℃, humidity 40%), repeated three times, and almost the same current value is obtained, which indicates that the sensor to be tested has good stability.

[0097] Example 2

[0098] Without starting the high-low temperature alternating damp heat test chamber 2, under the laboratory environment (i.e. the temperature is 25℃, and the humidity is 40%RH), the operation in Example 1 is repeated, only the starting state of the fan 107 and the position height of the hydrogen sensor 101 (the porous plate 102 is placed on the different height porous plate card slot 103 to adjust the position of the hydrogen sensor 101, and the porous plate 102 is placed at the lowest card slot 103 as height I (60mm away from the bottom of the sealed test chamber 1), and the highest card slot as height II (120mm away from the bottom of the sealed test chamber 1)) are changed, and the response curve comparison diagram of the hydrogen concentration of the hydrogen sensor 101 at different heights with and without the fan starting can be obtained.

[0099] Figure 6 is the hydrogen sensor evaluation test device of the application, and the response curve comparison diagram of the hydrogen sensor sensing performance under the condition that the H2 / Air concentration range is 0.5%. The response current values are 2.90±0.05mA (the fan is started, and the heights I and II), 2.90±0.05mA (the fan is not started, and the height I), and 5.20±0.15mA (the fan is not started, and the height II). It is illustrated that the fan can make the gas in the sealed test chamber diffuse quickly and uniformly, the hydrogen concentration in the sealed test chamber 1 is consistent, and the test process is more stable and reliable.

[0100] Example 3

[0101] Without starting the high-low temperature alternating damp heat test chamber 2, under the laboratory environment (i.e. the temperature is 25℃, and the humidity is 40%RH), the operation in Example 1 is repeated, the hydrogen gas flow is changed to 40mL·min -1 , the ventilation time is controlled to be 3s (0.025% H2 / Air) and 6s (0.05% H2 / Air), and the stable response curve of the hydrogen concentration can still be obtained at a lower concentration.

[0102] Figure 7 is the hydrogen sensor evaluation test device of the application, and the response curve comparison diagram of the hydrogen sensor sensing performance under the condition that the H2 / Air concentration range is 0.025% and 0.05%. The response current values are 0.03mA (0.025% H2) and 0.06mA (0.05% H2).

[0103] Example 4

[0104] The temperature of the high-low temperature alternating damp heat test chamber 2 is set to 30℃, the humidity is set to 60%RH, 80%RH and 90%RH respectively, and the operation in Example 1 is repeated, and the response curve of different hydrogen concentrations under different humidities can be obtained.

[0105] Figure 8is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%, temperature of 30℃, and humidity of 60%RH. The response current value range is 1.83mA (0.5% H2)-34.22mA (4.0% H2).

[0106] Figure 9 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%, temperature of 30℃, and humidity of 80%RH. The response current value range is 1.64mA (0.5% H2)-37.69mA (4.0% H2).

[0107] Figure 10 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%, temperature of 30℃, and humidity of 90%RH. The response current value range is 2.03mA (0.5% H2)-41.66mA (4.0% H2).

[0108] Example 5

[0109] The humidity of the high and low temperature alternating damp heat test box 2 is set to 60%RH, and the temperature is set to 20℃, 40℃, 60℃ and 80℃ respectively. The operation in Example 1 is repeated, and the response curves of different hydrogen concentrations at different temperatures (lower) can be obtained.

[0110] Figure 11 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%, humidity of 30%RH, and temperature of 20℃. The response current value range is 0.64mA (0.5% H2)-18.93mA (4.0% H2).

[0111] Figure 12 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%, humidity of 30%RH, and temperature of 40℃. The response current value range is 1.48mA (0.5% H2)-42.30mA (4.0% H2).

[0112] Figure 13 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%, humidity of 30%RH, and temperature of 60℃. The response current value range is 2.64mA (0.5% H2)-87.00mA (4.0% H2).

[0113] Figure 14 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0% and humidity of 30% RH and temperature of 80℃. The response current value range is 9.32 mA (0.5% H2)-104.00 mA (4.0% H2).

[0114] Example 6

[0115] The temperature of the high-low temperature alternating damp heat test chamber 2 is set to 0℃, -20℃, -40℃, respectively, and the operation in Example 1 is repeated, that is, the response curve of different hydrogen concentrations at different temperatures (lower) can be obtained.

[0116] Figure 15 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 1.0%-4.0% and temperature of 0℃. The response current value range is 1.04 mA (0.5% H2)-2.98 mA (4.0% H2).

[0117] Figure 16 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 1.0%-4.0% and temperature of -20℃. The response current value range is 0.12 mA (0.5% H2)-1.62 mA (4.0% H2).

[0118] Figure 17 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 1.0%-4.0% and temperature of -40℃. The response current value range is 0.31 mA (0.5% H2)-0.91 mA (4.0% H2).

[0119] Example 7

[0120] The high-low temperature alternating damp heat test chamber 2 is not started, and the operation in Example 1 is repeated under the laboratory environment (i.e. temperature of 25℃ and humidity of 40% RH), only the test gas is changed from the pure hydrogen gas cylinder in Example 1 to a gas cylinder containing a small amount of toxic gas CO (H2: 75%, CO: 50 ppm, CO2: 25%), the hydrogen flow is changed to 130 mL·min -1 , the gas flow time is controlled to 5 s (0.133 ppm CO+0.2% H2 / Air), and the above operation is repeated, only the gas flow time is changed, and the response curve of hydrogen concentration containing toxic gas CO can be obtained.

[0121] Figure 18is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.2%-2.0%. The response current value range is 0.28mA (0.2% H2)-8.23mA (2.0% H2).

[0122] Figure 19 is the hydrogen sensor sensing performance graph of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.2%-2.0% containing a small amount of CO. The response current value range is 0.03mA (0.2% H2)-1.55mA (2.0% H2).

[0123] Figure 20 is the linear fitting curve comparison graph between the response current and the hydrogen concentration (0.5%-4.0%) of the hydrogen sensor tested by the hydrogen sensor evaluation test device of the present application (with or without CO interference), the sensitivity is 4.5994mA / % (without CO) and 0.9603mA / % (with CO), respectively, and the sensitivity is reduced by 79.12%.

[0124] Example 8

[0125] Without starting the high and low temperature alternating damp heat test chamber 2, the operation in Example 1 is repeated under the laboratory environment (i.e. the temperature is 25℃ and the humidity is 40% RH), the test lines are connected to the two hydrogen sensors 101, the two hydrogen sensors 101 are placed side by side on the multi-well plate 102, the left side is sensor I and the right side is sensor II, the response changes of the two hydrogen sensors 101 are transmitted to the current recorder 401 at the same time, and the data analysis test on the PC end 402 can obtain the response curves of the hydrogen concentrations of the two hydrogen sensors 101 at the same time.

[0126] Figure 21 is the sensing performance graph of the two hydrogen sensors of the hydrogen sensor evaluation test device of the present application under the condition of H2 / Air concentration range of 0.5%-4.0%. The response current value range of sensor I is 1.05mA (0.5% H2)-22.0mA (4.0% H2), and the response current value range of sensor II is 1.20mA (0.5% H2)-55.00mA (4.0% H2).

[0127] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above examples without deviating from the technical scheme of the present application should be covered in the protection scope of the present application.

Claims

1. A multifunctional hydrogen sensor evaluation and testing device, characterized in that, The test chamber includes a sealed test chamber (1), a high and low temperature alternating damp heat test chamber (2), a gas control module (3), and a test analysis module (4). The sealed test chamber (1) is located inside the high and low temperature alternating damp heat test chamber (2). The gas control module (3) and the test analysis module (4) are located outside the high and low temperature alternating damp heat test chamber (2). The sealed test chamber (1) is connected to the gas control module (3) and the test analysis module (4) respectively. The sealed test chamber (1) is the place for evaluating and testing hydrogen sensors. The sealed test chamber (1) includes: a sealed test chamber body and a sealed test chamber door (104). The sealed test chamber body is equipped with a hydrogen sensor to be tested (101), a perforated plate (102), and a fan (107). The bottom of the sealed test chamber body is equipped with a fan (107), and the perforated plate (102) is located above the fan (107). The hydrogen sensor to be tested (101) is placed on the perforated plate (102). The inner side wall of the sealed test chamber body is equipped with a perforated plate slot (103) for placing the perforated plate (102). The sealed test chamber body is equipped with an air inlet (108), an air outlet (109), and a pressure gauge (110). The high and low temperature alternating damp heat test chamber (2) includes a high and low temperature alternating damp heat test chamber body, a high and low temperature alternating damp heat test chamber door, a temperature control module (201), and a humidity control module (202). The temperature control module is used to regulate the temperature of the gas inside the high and low temperature alternating damp heat test chamber, and the humidity control module is used to regulate the humidity of the gas inside the high and low temperature alternating damp heat test chamber. The sealed test chamber (1) is placed in the high and low temperature alternating damp heat test chamber (2) to form a set of chambers. The sealed test chamber (1) is completely under the damp heat control of the high and low temperature alternating damp heat test chamber (2). Through the gas exchange between the sealed test chamber (1) and the high and low temperature alternating damp heat test chamber (2), the gas in the sealed test chamber (1) reaches the target temperature and humidity. The gas control module (3) can be used to supply hydrogen (301) and other interfering / toxic gases (302) to the sealing test chamber (1). The gas control module (3) includes a pressure reducing valve (303), a gas mass flow controller (304), a gas mixer (305), and a vacuum pump (306). The pressure reducing valve (303) is connected to the gas inlet (108) of the sealing test chamber (1) in sequence through the gas mass flow controller (304) and the gas mixer (305). The gas outlet (109) of the sealing test chamber (1) is connected to the vacuum pump (306). The test analysis module (4) includes a current recorder (401) and a PC terminal (402), which can perform signal acquisition and signal processing analysis. The test analysis module (4) is connected to the hydrogen sensor (101) under test in the sealed test chamber (1). The testing method for the aforementioned multifunctional hydrogen sensor evaluation and testing device includes the following steps: (1) First, set the temperature and humidity values ​​of the high and low temperature alternating damp heat test chamber (2). The temperature and humidity are controlled by the temperature control module (201) and the humidity control module (202). After the high and low temperature alternating damp heat test chamber (2) reaches the target temperature and humidity and is stable, open valve II (502) and valve III (503). Connect the sealed test chamber (1) and the high and low temperature alternating damp heat test chamber (2) through the air inlet (108). Connect the sealed test chamber (1) to the outside atmosphere through the air outlet (109). Start the vacuum pump (306). In this process, the gas in the sealed test chamber (1) is discharged to the outside atmosphere. The air in the high and low temperature alternating damp heat test chamber (2) that has reached the set temperature and humidity enters the sealed test chamber (1). After a period of time, close valve II (502) and valve III (503) and turn off the vacuum pump (306). The gas in the sealed test chamber (1) will be completely replaced with the stable set temperature and humidity air. (2) Open valve I (501) and connect the gas control module (3) to the sealing test chamber (1) through the inlet (108). Hydrogen gas (301) passes through the pressure reducing valve (303), gas mass flow controller (304), gas mixer (305), and inlet (108) in sequence before entering the sealing test chamber (1). When the gas supply ends, close valve I (501) and control the gas flow rate and gas supply time through the gas mass flow controller (304). The sealing test chamber (1) can then be sealed. The hydrogen-air mixture of different concentrations can be configured in the gas chamber. When conducting the anti-toxicity test, other interfering / toxic gases only need to be passed through the pressure reducing valve (303) and the gas mass flow controller (304) at the same time. Then, the hydrogen gas and other interfering gases are mixed in the gas mixer (305) and then enter the sealed test chamber (1) through the valve I (501) and the inlet (108). By repeating the above operation, hydrogen-air mixtures of different concentrations containing other interfering / toxic gases (302) can be configured in the sealed test chamber (1). (3) The hydrogen sensor (101) under test comes into contact with the prepared test gas. The electrical signal generated by the hydrogen sensor (101) under test is transmitted to the current recorder (401) and the PC (402) through the test line (105) for signal acquisition and signal processing analysis.

2. The multifunctional hydrogen sensor evaluation and testing device according to claim 1, characterized in that, The sealing test chamber body, sealing test chamber door (104), perforated plate (102), and perforated plate slot (103) are made of polymethyl methacrylate; a sealing ring is provided between the sealing test chamber door (104) and the sealing test chamber body; multiple perforated plate slots (103) of different heights are provided inside the sealing test chamber. The sealed test chamber is equipped with an aviation plug-in plate (106), which connects the test lines (105) inside and outside the sealed test chamber (1). The test lines (105) inside the sealed test chamber (1) are connected to the hydrogen sensor (101) to be tested, and the test lines (105) outside the sealed test chamber (1) are connected to the PC terminal (402).

3. The multifunctional hydrogen sensor evaluation and testing device according to claim 2, characterized in that, The aviation insert (106) is embedded in the housing of the sealed test chamber (1); multiple test lines (105) are connected to multiple hydrogen sensors (101); the high and low temperature alternating damp heat test chamber is provided with ventilation holes for replenishing air into the chamber.

4. The multifunctional hydrogen sensor evaluation and testing device according to claim 1, characterized in that, The air inlet (108) and air outlet (109) of the sealing test chamber (1) are located on both sides of the sealing test chamber body, and the pressure gauge (110) is located on the top of the sealing test chamber body; A pressure stabilizing device (111) is also provided between the sealed test chamber and the pressure gauge (110).

5. The multifunctional hydrogen sensor evaluation and testing device according to claim 1, characterized in that, The other interfering / toxic gas (302) is at least one of carbon oxides, nitrogen oxides, and sulfur-containing compounds.

6. The multifunctional hydrogen sensor evaluation and testing device according to claim 1, characterized in that, The air inlet (108) of the sealed test chamber (1) is connected to the gas mixer (305) of the gas control module (3) via valve I (501); the air inlet (108) of the sealed test chamber (1) is connected to the gas inside the high and low temperature alternating damp heat test chamber (2) via valve II (502); the air outlet (109) of the sealed test chamber (1) is connected to the vacuum pump (306) of the gas control module (3) via valve III (503).

7. The multifunctional hydrogen sensor evaluation and testing device according to claim 1, characterized in that, The electrical signal generated by the hydrogen sensor under test (101) is transmitted to the current recorder (401) via the test line (105), and finally the data is analyzed on the PC (402).

8. The multifunctional hydrogen sensor evaluation and testing device according to claim 1, characterized in that, After one test, repeat the above steps (1), open valves II (502) and III (503), start the vacuum pump (306), and after a period of time, close valves II (502) and III (503), and turn off the vacuum pump (306). The gas in the sealed test chamber (1) will return to its previous state and be completely replaced with stable air at the set temperature and humidity. Repeat steps (2) and (3) for testing. During the test, the fan (107) remained in the start state at all times.

9. The application of the multifunctional hydrogen sensor evaluation and testing device according to any one of claims 1-7 in the performance testing of hydrogen sensors.

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